Image_Decorator

gistfile1.txt

 interface IImagePersistor
  {
    void Save(Image image, string name);
  }

  class FilePersistor : IImagePersistor
  {
    public void Save(Image image, string name)
    {
      var stream = File.Open(name);
      stream.Write(RawData, 0, Length);
      stream.Close();
    }
  }

  class FormatAwarePersistorDecorator : IImagePersistor
  {
    private IImagePersistor m_innerPersitor;
    public FormatAwarePersistorDecorator(IImagePersistor persistor)
    {
      if (persistor == null)
      {
        throw new ArgumentNullException();
      }
      m_innerPersitor = persistor;
    }

    void IImagePersistor.Save(Image image, string name)
    {
       //vyber image.RawData/Transformuj podle přípony souboru (klidně další pomocné objekty v pozadí)
      Image newImageWithSpecialFormat = Convert(image.RawData, name);
      m_innerPersitor.Save(newImageWithSpecialFormat);
    }
  }
  class Image
  {
    private IImagePersistor m_imagePersistor;

    public Image()
    {
      
      m_imagePersistor = new FormatAwarePersistorDecorator(new FilePersistor());
    }

    public IImagePersistor ImagePersistor
    {
      get
      {
        return m_imagePersistor;
      }

      set
      {
        m_imagePersistor = value ?? FormatAwarePersistorDecorator(new FilePersistor());
      }
    }

    public int Length
    {
      get;
      private set;
    }

    public Byte[] RawData
    {
      get;
      set;
    }

    public void Save(string name)
    {
      m_imagePersistor.Save(this, name);
    }

    
  }